Thermotunable Terahertz Negative-Index Metamaterials with Dielectric Spheres Embedded in Semiconductor Host
Thermotunable Terahertz Negative-Index Metamaterials with Dielectric Spheres Embedded in Semiconductor Host
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DOI：
10.1155/2018/2794161
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发表时间：
2018-09
影响因子：
1.5
通讯作者：
Yu Chen;Zhihao Chen;Binyi Qin;X. Dai
中科院分区：
文献类型：
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作者：
Yu Chen;Zhihao Chen;Binyi Qin;X. Dai
从理论上研究了实现太赫兹波段可调谐各向同性负折射率材料的可能性。所提出的复合超材料由随机嵌入半导体主介质中的电介质球组成。由于InSb中的本征载流子密度的变化，由于温度的变化，从而改变等离子体频率，我们在理论上示出了所提供的复合超材料，其折射率是热可调的，并且潜在地传播损耗较小。此外，还讨论了介质球半径对调制频率和带宽的影响。最后，我们发现，复合材料的设计参数可以缩放应用在更高的频率区域。
A possibility to realize thermotunable isotropic negative-index metamaterials up to terahertz regime is theoretically investigated. The proposed composite metamaterials consist of dielectric spheres embedded randomly in a semiconductor host medium. As the variation in the intrinsic carrier density in InSb due to a variation in temperature thus changes the plasma frequency, we show theoretically the provided composite metamaterials whose index of refraction is thermally tunable and potentially less propagation loss. Furthermore, the effects of the radius of the dielectric sphere on the modulation frequency and bandwidth are discussed. Finally, we find that the design parameters for the composites can be scaled for application in the higher frequency regions.